#include <stdio.h>
int main(void)
{
    const int dunbar_num = 150;
    int friends = 5;
    int weeks = 1;

    while (friends <= 150)
    {
        friends = (friends - weeks) * 2;
        if (friends > 150)
            break; 
        printf("第%d周有%d个朋友\n", weeks, friends);
        weeks++;
    }
    
    return 0;
}